CRC RevEng Icon

CRC RevEng

Arbitrary-precision CRC calculator and algorithm finder

5.0 Stars (2)
62 Downloads (This Week)
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CRC RevEng is a portable, arbitrary-precision CRC calculator and algorithm finder. It calculates CRCs using any of the 102 preset algorithms, or a user-specified algorithm to any width. It calculates reversed CRCs to give the bit pattern that produces a desired forward CRC. CRC RevEng also reverse-engineers any CRC algorithm from sufficient correctly formatted message-CRC pairs and optional known parameters. It comprises powerful input interpretation options. Compliant with Ross Williams' Rocksoft(tm) model of parametrised CRC algorithms.

CRC RevEng Web Site


  • Reverse-engineers CRC algorithms
  • Arbitrary precision, calculates and solves CRCs of any bit width
  • Bit oriented, accepts messages of any bit length
  • Handles binary, octal, hex, and text input strings, 7-bit and 8-bit files
  • Calculates CRCs forwards or backwards, to help produce a desired CRC value
  • Define your own algorithm, or use one of 102 traceable presets
  • Written in portable C, adapts to most architectures


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User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 5 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 5 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 5 / 5
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User Reviews

  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Nice project for such specific job. It help me to gain much time writing my own to reverse crc of raw data from a sondex memory after GE support avoided to tell me. And finally I could fix the corrupted file.

    Posted 11/17/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Really good project! It probably saved me a lot of time ;-).

    Posted 07/04/2014
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Intended Audience

Information Technology, Telecommunications Industry, Developers, Security Professionals, Engineering

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